✓ Board-verified
Science · 2024 · 3 marks
CBSE 2024 · Region 4 · Set 1 · Q30
List two differences between dominant traits and recessive traits. What percentage of pea plants in the $\displaystyle \mathrm{F}_{2}$ generation were with yellow seeds in Mendel's cross between the pea plants having yellow (YY) and green coloured (yy) seeds ?
Marking-scheme solution
| Dominant Traits | Recessive Traits |
| (i) When both dominant and recessive traits are inherited, the dominant trait gets expressed. | (i) When both dominant and recessive traits are inherited, the recessive trait does not get expressed. |
| (ii) A single copy of dominant trait is enough to get it expressed. | (ii) Both the copies of a trait should be recessive to get it expressed. |
$\displaystyle 75$% yellow seeds
More from Heredity
- In human beings, there are 23 pairs of chromosomes. Out of these 23 pairs of chromosomes (i.e. 46…2025 · asked 3×
- Two pea plants, one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds were crossed…2026 · asked 3×
- Assertion: Human female has a perfect pair of sex chromosome. Reason (R): Sex chromosome contributed by the…2024 · asked 3×
- Assertion: Human populations show a great deal of variations in traits. Reason (R): All variations in a…2023 · asked 3×
- Assertion: A mango seed will germinate to form a mango tree. Reason (R): Heredity determines the process by…2025 · asked 3×
- All human chromosomes are not paired. Most human chromosomes have a maternal and a paternal copy, and we have…2023 · asked 3×
- Consider the following two statements: (i) The trait that expresses itself in F 1 generation. (ii) The trait…2023 · asked 3×
- Using height (tallness / dwarfness) of a plant as an example, show that genes control the characteristics or…2022 · asked 3×
CBSE Class 10 Science past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.